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Offline Eugene52Topic starter
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« on: February 22, 2009, 09:46:27 pm »
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If you want to build a "Pulse Induction" Metal Detector , here is a very educational and informative 20 page tutorial-study with a few great illustrations.

 Great...............................Eugene52

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Offline electech2u
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« Reply #1 on: March 01, 2009, 06:59:17 pm »
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very interesting, just a few minutes here and there and ive already learned more about metal detectors than anywhere else ive looked.

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Offline electech2u
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« Reply #2 on: March 01, 2009, 07:03:50 pm »
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has anyone ever used a reflector over the top of the search coil to focus more of the energy in only one direction? i am guessing that the pulse radiates both down into the ground and also in the opposite direction(up into the air)?

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Offline Eugene52Topic starter
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« Reply #3 on: March 01, 2009, 08:31:23 pm »
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Hello electech2u , you are correct !! Search coils are typically designed to have more Magnetic field focused under the coil instead of on top facing your shaft/rod of the Metal detector . Some manufactures have a non-metalic lower shaft To eliminate false signals of your own machine . I guess a Field strength circuit can be built for Directional Magnetic testing of your search-coil  !!! Concentic coils are sharper for pin-pointing and DD is much more efficient with less magnetic field occuring above the search-coil . Metal shielding above the coil might be difficult to perfect . I think experimenting with the coil windings is the key to making directional coils Great...................................Eugene52

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« Last Edit: March 01, 2009, 08:45:35 pm by Eugene52 » 		Logged
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Offline electech2u
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« Reply #4 on: March 01, 2009, 08:35:33 pm »
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do any of the metal detectors employ a trigger so you can switch coils "on the fly" ?

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Offline Eugene52Topic starter
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« Reply #5 on: March 01, 2009, 09:08:47 pm »
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Hello , as far as I know , I do not think someone has Manufactured a dual or triple search coil that is toggle switched at the Detector . Even Minelabs Exterra series you have to physically change the coils to different frequencies to be more efficient on gold nuggets or  coin detecting . I am sure you can invent a dual or triple search coil configuration  , but they will have to spaced so far apart and also the added extra weight will be a negative . Or even some multiple coil windings out of phase in ONE "search-coil enclosure" might be impossible to engineer with a remote switch  . Engineers have already tested these things  , trying to Re-Invent the wheel again , or inventing a new improoved wheel  Crazy Shocked Grin. Great Ideas you are posting , Directional High power Search coils  Great

 Wise Wise............ Waveing..................Eugene52

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Offline electech2u
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« Reply #6 on: March 01, 2009, 09:14:30 pm »
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if you used more than one coil the would have to all resonate with each other and the trigger on the handle would have to  switch the configuation of which coil is the driven element/reflector/director which would serve to focus the beam width and gain of the array. weight would have to be addressed with maybe carbon fiber materials such as are used in racing bikes.

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Offline electech2u
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« Reply #7 on: March 01, 2009, 09:15:38 pm »
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with higher gain you could also use lower power and the battery life would increase


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Offline electech2u
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« Reply #8 on: March 01, 2009, 09:20:38 pm »
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I was wondering, is there a tuning adjustment on the board to match the circuit to the coils?

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Offline aakv01
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« Reply #9 on: April 17, 2011, 12:11:56 am »
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Thanks, But i need a tutorial that help me to detect material of metal(by PI Metal Detector) - excuse for my bad english Round About

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